package com.xgp.forkjoin;

import java.util.concurrent.ExecutionException;
import java.util.concurrent.ForkJoinPool;
import java.util.concurrent.ForkJoinTask;
import java.util.stream.LongStream;

public class Test {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
//        test1();        //9172
//        test2();        //8866
        test3();        //770
    }

    public static void test1() {
        long start = System.currentTimeMillis();
        Long sum = 0L;
        for (Long i = 1L;i <= 10_0000_0000;i++) {
            sum += i;
        }
        long end = System.currentTimeMillis();
        System.out.println("sum =" + sum + "\t时间：" + (end -start));
    }
    public static void test2() throws ExecutionException, InterruptedException {
        long start = System.currentTimeMillis();

        ForkJoinPool forkJoinPool = new ForkJoinPool();
        Demo1 task = new Demo1(0L, 10_0000_0000L);
        ForkJoinTask<Long> submit = forkJoinPool.submit(task);
        Long sum = submit.get();

        long end = System.currentTimeMillis();
        System.out.println("sum =" + sum + "\t时间：" + (end -start));
    }
    public static void test3() {
        long start = System.currentTimeMillis();

        long sum = LongStream.rangeClosed(0L, 10_0000_0000).parallel().reduce(0, Long::sum);

        long end = System.currentTimeMillis();
        System.out.println("sum =" + sum + "\t时间：" + (end -start));
    }
}
